41 lines
1.3 KiB
HTML
41 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>Optimization of requestAnimationFrame callbacks that don't modify the DOM shouldn't break animations</title>
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<link rel="author" title="Mukilan Thiyagarajan" href="mailto:mukilan@igalia.com">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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</head>
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<body>
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<div id="target">0</div>
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</body>
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<script>
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"use strict";
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async_test(function(test) {
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let frame = 0;
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const draw = (t) => {
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frame += 1;
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if (frame < 11) {
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// Don't mutate the DOM for 10 frames to meet the threshold for Servo's
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// spurious frame optimization to kick in.
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requestAnimationFrame(draw);
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} else if (frame == 11) {
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// Don't schedule next rAF so the compositor's tick is disabled.
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// This is specific to Servo as the spurious frame detection at the
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// time of this test was broken.
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test.step_timeout(() => {
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requestAnimationFrame(draw);
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}, 0);
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} else {
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// Normal frames.
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document.getElementById('target').innerText = t;
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requestAnimationFrame(draw);
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}
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};
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let target = document.getElementById('target');
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test.step_timeout(test.step_func_done(() => {
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assert_greater_than(parseInt(target.innerText), 500);
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}), 550);
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requestAnimationFrame(draw);
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});
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</script>
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